Heatsink

Abstract

The present invention provides a heatsink, which is coupled to a pack tray, on which a plurality of secondary batteries are mounted, and comprises an inlet and an outlet so that cooling water is introduced into and discharged from a chamber therein, the heatsink comprising: a dimple convexly protruding to the inside of the chamber to form a flow path of the cooling water, wherein the dimple is provided in plurality, and the plurality of dimples are spaced apart from each other, wherein the dimples are disposed so that a gap between the dimples adjacent to each other in a specific area and a gap between the dimples adjacent to each other in the other area are different from each other.In the present invention having the above-described constituents, the gap between the dimples may vary to prevent deformation and bending in the specific direction.

1 . A heatsink for coupling to a pack tray, on which a plurality of secondary batteries are mounted, the heatsink comprising:
 a chamber for receiving cooling water;   an inlet for introducing the cooling water into the chamber;   an outlet for discharging the cooling water from the chamber; and   a plurality of dimples convexly protruding into the chamber to define a flow path of the cooling water,   wherein the plurality of dimples are spaced apart from each other, and   wherein the dimples are arranged so that a first spacing between the dimples adjacent to each other in a first region of the chamber is different from a second spacing between the dimples adjacent to each other in a second region of the chamber.   
     
     
         2 . The heatsink of  claim 1 , wherein the heatsink has a rectangular plate shape having two long sides and two short sides, the long sides being longer than the short sides,
 wherein the inlet and the outlet are disposed at opposing ends of one of the two short sides.   
     
     
         3 . The heatsink of  claim 2 , wherein the dimples disposed closer to the inlet and the outlet are arranged at higher density than the dimples disposed further away from the inlet and the outlet. 
     
     
         4 . The heatsink of  claim 3 , wherein the dimples are disposed closer to the long sides as the dimples are closer to the inlet and outlet along a longitudinal direction of the long sides, and the dimples are disposed farther away from the long sides as the dimples are farther away from the inlet and outlet along the longitudinal direction. 
     
     
         5 . The heatsink of  claim 1 , wherein the dimples have a circular shape. 
     
     
         6 . The heatsink of  claim 5 , wherein the dimples have the same diameter. 
     
     
         7 . The heatsink of  claim 2 , wherein the heatsink includes a through-part passing through the inside of the chamber along a thickness direction, the through-part having a through-hole therein. 
     
     
         8 . The heatsink of  claim 7 , wherein the through-part comprises a support part that protrudes from a surface of the heatsink and is configured to be in close contact with a surface of the pack tray when the heatsink is coupled to the surface of the pack tray, and
 wherein the through-hole is defined in the support part.   
     
     
         9 . The heatsink of  claim 8 , wherein a plurality of the through-parts are disposed along a virtual line connecting an intermediate point of each of the two short sides to each other, and
 wherein the plurality of through-parts are spaced apart from each other along a longitudinal direction of the long sides.   
     
     
         10 . The heatsink of  claim 1 , wherein each of the inlet and the outlet has a perimeter surface extending to the chamber that is angled so as to increase a cross-sectional area of the respective inlet and outlet along a direction towards the chamber. 
     
     
         11 . A battery module, comprising:
 the heatsink of  claim 1 ; and   the pack tray having the plurality of secondary batteries mounted thereon.